noun Etymology: New Latin, from Greek didymos twin, from dyo two — more at two Date: 1842 a mixture of rare-earth elements made up chiefly of neodymium and praseodymium and used especially for coloring glass for optical filters

New Collegiate Dictionary. 2001.

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  • Didymium — (Greek: twin element) is a mixture of the elements praseodymium and neodymium. It is used in safety glasses for glassblowing and blacksmithing, especially when a gas (propane) powered forge is used, where it provides a filter which selectively… …   Wikipedia

  • Didymium — in the first edition periodic table of Mendeleev Le didymium est un mélange du praséodyme et de néodyme, deux éléments simples. On l utilise pour faire des verres qui arrêtent efficacement la lumière émise par le sodium en fusion, tout en… …   Wikipédia en Français

  • Didymium — ist: eine Gattung innerhalb der Schleimpilze, siehe Didymium (Schleimpilze) ein Synonym für Didym, eine Legierung zweier seltener Erden Diese Seite ist eine Begriffsklärung zur Unterscheidung mehrerer …   Deutsch Wikipedia

  • Didymium — Di*dym i*um, n. [NL., fr. Gr. ? twin.] (Chem.) A rare metallic substance usually associated with the metal cerium; hence its name. It was formerly supposed to be an element, but has since been found to consist of two simpler elementary substances …   The Collaborative International Dictionary of English

  • Didymĭum — (D. Schrad., Lk.), Pilzgattung aus der Familie der Gasteromycetes Trichospermei Physarei …   Pierer's Universal-Lexikon

  • didymium — [dī dim′ē əm] n. [ModL: so named (1841) by C. G. Mosander (see LANTHANUM) < Gr didymos, twin (because assoc. with lanthanum) + IUM] 1. a rare metal, formerly considered an element but later found to be a mixture of rare earth elements… …   English World dictionary

  • didymium — ⇒DIDYME2, DIDYMIUM, subst. masc. CHIM. Mélange de deux métaux appartenant au groupe des terres rares, dont les composés sont difficilement séparables de ceux du lanthane : • Ce ne serait évidemment pas la première fois que les chimistes en… …   Encyclopédie Universelle

  • didymium — /duy dim ee euhm, di /, n. Chem. a mixture of neodymium and praseodymium, formerly thought to be an element. Symbol: Di [ < NL < Gk dídym(os) twin (see DIDYMOUS) + IUM; so named by Swedish chemist Carl Mosander (1797 1858), who discovered it in… …   Universalium

  • didymium — noun A mixture of praseodymium and neodymium once thought to be an element (symbol Di) …   Wiktionary

  • Didymium — Di|dym, Di|dy|mi|um [griech. dídymos = Zwilling; ↑ ium (1)], das; s: 1) ursprünglicher Name für einen Stoff, der für ein neues, mit Lanthan »verzwillingtes« chem. Element gehalten, später jedoch in ↑ Neodym u. ↑ Praseodym zerlegt wurde; 2)… …   Universal-Lexikon

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